C++ 关系运算符 == 与字符串

Question

我收到一个错误，提示我无法使用关系运算符“==”来测试字符串与字符串的匹配。是否因为数组(字符串)而需要不同的运算符？

int searchArray(string name, string &firstNameArray); // declares the function

int main()
{
    string firstNameArray[7] = { "Jim", "Tuyet", "Ann", "Roberto", "Crystal", "Valla", "Mathilda" }; //declares and intializes the array

    string name = ""; 
    cout << "What's your name?"; 
    getline(cin, name);

    searchArray(name, firstNameArray[7]); // using the function


    return 0;
}

int searchArray(string name, string &firstNameArray) { //defining the function


    int position = 0; //declaring and intializing the return variable - positions 0 thru 6 for array elements and position 7 for not in array

    for (int i = 0; i < 7; i++) { //looping through the array

        if (firstNameArray[i] == name) //**error code "no operator "==" matches these operands
        {
            position == firstNameArray[i];
        }
        else
        {
            position == 7;
        }

    }

    return position;

}

Answer 1

更正/建议 - 有关评论的更多详细信息:

    //const references
    //use of vector
    //use of vector size variable

    int searchArray(const string & name, const vector<string> & firstNameArray) { 
            int position = -1; //declaring and intializing the return variable - positions 0 thru 6 for array elements and position 7 for not in array

            for (int i = 0; i < firstNameArray.size(); i++) { //looping through the array
                //== is for comparison
                if (firstNameArray[i] == name)
                {
                    position = i; //= is for assignment
                    break; // without break always returns not found
                }
            }
            return position;
        }

        int main(int argc,const char * argv[]) {

            vector<string> firstNameArray = { "Jim", "Tuyet", "Ann", "Roberto", "Crystal", "Valla", "Mathilda" }; //declares and intializes the array

            string name ;
            cout << "What's your name?";

            getline(cin, name);

            cout << "position: " << searchArray(name, firstNameArray) << endl; 


            return 0;
        }